Question

con- 43. It is estimated that the Coma cluster (see Figure 23-211 tains about 1013 Mo of intracluster gas. (a) Assuming that t gas is made of hydrogen atoms, calculate of intracluster gas atoms in the Coma cluster. (b) The Coma cluster is roughly spherical in shape, with a radius of about 3 Mpc. Calculate the number of intracluster gas atoms per cubic centimeter in the Coma cluster. Assume that the gas fills the cluster uniformly. (c) Compare the intracluster gas in the Coma cluster with the gas in our atmosphere (3 × ecules per cubic centimeter, temperature 300 K); a typical gas cloud within our own Galaxy (a few hundred molecules per cubic centimeter, temperature 50 K or less); and the corona ot the Sun (10% atoms per cubic centimeter, temperature 10° the total number 1019 mol-

Answer 1

M- o 13 M 1042 MH, 10-3 rs 6 023 2 2 6 10 6 023 jn 刘一 ワ 12x10 egeu

2 っ3:56 x10-e Temp aun 3、5/ eu hun dred /o 5